v1.6.3-unreleased: Sunstrider zone fixes, QuestieLearner icon preservation, migration, and Busted test suite

Code changes (13 files, +916/-171):
- ZoneDB integration: GetZoneId() converts uiMapId→areaId via ZoneDB reverse lookup
- MIN_CONFIDENCE_PINS reduced to 1 for Ascension (incomplete NPC DBs)
- QuestieLearner icon preservation: objective Icon passed to RegisterObjectiveTooltip
- InjectLearnedData zone migration: converts old uiMapId spawn keys to areaId
- areaId passed through all LearnNPC call sites (OnMouseoverUnit, OnQuestDetail,
  OnQuestComplete, OnQuestAccepted, OnQuestTurnedIn, OnGossipShow)
- Compat/Compat.lua: C_Map.GetPlayerMapPosition UiMapData support
- Compat/HBD.lua: Sunstrider mapData aliases and fallback loading
- Sunstrider arrow fix (QuestieArrow.lua), resolved pin rendering (QuestieMap.lua)
- _MergeOverride helper for string/numeric key compatibility
- Northshire Valley UiMapData registration

Testing infrastructure:
- .busted config pointing to tests/ directory
- Tests/wow_api_mock.lua: WoW API mocks (ZoneDB, C_Map, QuestLogCache, etc.)
- Tests/QuestieLearner_spec.lua: 12 tests covering coordinate scaling, spell cast
  learning, zone migration (NPC/objects), icon preservation, settings defaults,
  and LearnNPC spawn zone tracking
- selene.toml + wow_classic.yml: linter configuration

Documentation:
- Makefile with test/lint/ci targets
- sunstrider-coordinate-collection.md: coordinate data reference
- sunstrider-pin-fix.md: root cause analysis and fix documentation

Compat/Compat.lua

@@ -304,6 +304,33 @@ end
 
 QuestieCompat.C_Map = {
     GetPlayerMapPosition = function(uiMapID, unitToken)
+        unitToken = unitToken or "player"
+
+        if uiMapID and QuestieCompat.UiMapData and QuestieCompat.UiMapData[uiMapID] then
+            local originalMapAreaID = GetCurrentMapAreaID()
+            local originalDungeonLevel = GetCurrentMapDungeonLevel and GetCurrentMapDungeonLevel() or 0
+            local mapID = QuestieCompat.UiMapData[uiMapID].mapID
+            local dungeonLevel = QuestieCompat.Round(math.mod(mapID, 1) * 10)
+
+            SetMapByID(math.floor(mapID) - 1)
+            if dungeonLevel > 0 and SetDungeonMapLevel then
+                SetDungeonMapLevel(dungeonLevel)
+            end
+
+            local x, y = GetPlayerMapPosition(unitToken)
+
+            if originalMapAreaID and originalMapAreaID > 0 then
+                SetMapByID(originalMapAreaID - 1)
+                if originalDungeonLevel and originalDungeonLevel > 0 and SetDungeonMapLevel then
+                    SetDungeonMapLevel(originalDungeonLevel)
+                end
+            else
+                SetMapToCurrentZone()
+            end
+
+            return { uiMapID = uiMapID, x = x, y = y }, uiMapID
+        end
+
         return QuestieCompat.GetPlayerMapPosition()
     end,
     -- Returns map information.